How To Replace Letters In A String In Python

what up everybody zach here welcome back to case digital in today's video we're actually going to be discussing the question of how to replace letters in a string in python so without further ado let's hop right in start coding whatever is so like i mentioned we are replacing letters or tackling that question of how to replace letters in a string in python and i want to make this quick little video because essentially um this is one i use a lot and sometimes um you know i see a lot of people especially when i had was started was starting out you know had a lot of questions about how to do some of these things and like when you learn about this and doing different things like you can learn how to iterate through stuff use loops to go through like a string and you know replace things or get the index and then go do that but essentially in python they make it really easy with the string method of replace um really simple i have one of my previous videos i believe i talked about how to like remove characters you can do you can help you can use this replacement to help remove some of those characters but its ultimate goal is to replace a character with whatever you want it to be so in this horribly spelled example um i am going to walk you through how i would use the replace method to essentially create this sentence into a kind of a sentence that makes more sense so one way we can do that is we can essentially just like i mentioned use that replace function where we just go text i'm going to say text is going to be equal to text dot replace um and you have to be careful because if i were just like so for instance let's just start talking about like i want to replace this word to make to say today so if i change this to um replace w with d then what you have to be careful is if i print this out now um date one is going to equal to text if i run this now what you'll see is it looks like today oh hey we did it we made you know we've made this into today like we wanted to s gun yeah i'm not even trying to pronounce any of this um but you see like but then we change this to a great day and oh look it also changed this w here to be the d as well and that's one thing you have to be very careful about because in this in this way we are actually fortunate enough that it turned into the word that we wanted to which was unintended um but look we got today and day and like the goal of this sentence i was trying to say is today is going to be a great day um and it did that but that's one thing that you need to be very careful about within place is if you do pass in the string that you're replacing or that you're going to use replace on essentially it'll do that for the whole string so anytime it finds like in our case that we put a w anytime it found a w throughout the whole string it replaced it with d so for instance if i had like another w up here like it was just all like something like that you'll see it's going to change all of those w's to be a d so if for instance you have as part of a sentence where you don't want to change the w you probably should do something where it's like you can actually use this replacement to do whole words to way to be today and if i run that now you'll see that this now stayed the same it's all the w's and that is today so that's just one thing um that you need to be watchful of of when you're using the replace method is it'll go through whatever string you pass it in it'll it'll go through and replace everything with what if it finds like a letter or phrase or whatever you put in there it's gonna replace the whole thing um so if we go back to our original thing to d now we can just essentially try this with i'm just going to copy and paste this and do this and we can now try an i you know i or an e with an i but again what happens if you do this is the fact that you're going to run into an issue because i just changed that i got this correct and then that changed that but so it's like oh man like i'm messing up my string well that's where like i mentioned you go back and uh you change this to match you know specific words like s is and then you get hey j is gonna change i can then i can do something like uh i can keep copy and paste this but this is the other thing i wanted to show essentially you can just do a dot replace again on top of that isn't that crazy where i can say uh double n i want to change out for just one end um if i run that now what is that gonna give me update two hey gone i wanna be so you can do stuff like that now i wanna change the instead of that i was like oh that's actually not what i want um i wanna change that double n e would be a double and a so you can just you can mess around and that's the beautiful thing about replaces i can just cascade all these and the reason being is because this essentially is a function call so when it returns like you saw up here it's going to return that value to this it's going to basically have another string value and so you can say like well this is a string value so i can just tack on another dot replace and that'll then be this will be an additional string value and then if i end up here um i can say well actually i don't like that you know that and i'm gonna say today is a let's say going to if i switch that out you'll see hey today is going to be a and then i can switch out you know this word switch that out or and now we have today is going to be a great day question mark but then i could just switch out that last letter dot replace um so the question mark with a exclamation point and now we get an excite rather than a question we get an exciting sentence about today is going to be a great day so that is essentially how you can replace letters uh phrases um sentences even if you wanted to um because i could use this whole thing like i could pass this in as my um my sentence i could say print um x dot replace and i'm gonna just say i'm gonna pass this whole thing in right i'm gonna say replace this whole text with um today is going to be a great day so i can replace that and i can print that out and that should be our first thing that comes up and it says today is going to be a great day so that's the thing is you could pass this whole variable and increase the whole sentence so any time like say you have like editing a book i don't know like you had a bunch of text you're going through and you saw like this sentence keep popping up and you're like well i don't really want to be that i want to re-edit it like or do something like you can make this be something where it's just like take that whole line replace it with you know my new line um but essentially you can use a replace method you can pass in whole things um you can use individual letters individual characters you can even do it with numbers like if there was a one here um i could say dot replace um one with nothing and you should see our final result should be right there and today's gonna be a great day with nothing on it so um and yeah the update one that removed that one so there it is that is essentially how you can use um the python string replace method to replace letters in a string within python try this out on some of your programs that you're messing with if you have any questions or comments please leave them down in the comment section below and i will do my best to answer them and or spin off a whole nother video to answer those questions that you may have if this prov if this video provided any value please hit that like button help us boost that youtube algorithm and if you haven't subscribed we'll subscribe let's learn together about python software development and any other questions you have related to programming and until next time keep on coding and have a great day

Channel: Case Digital

Views: 188

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Keywords: Software, software developer, developer, python, python tutorial, programming, programmer, python programming, how to replace letters in a string in python, how to replace letters in string in python, how to use string replace in python, how to replace part of a string in python, how to replace a string in python, how to replace a character in a string in python, how to replace a letter in a string in python, python string, python strings, how to replace a word in a string in python

Id: 91hDoKIptS8

Length: 6min 39sec (399 seconds)

Published: Thu Jul 08 2021